A phone-based YOLOv5+Kalman pipeline estimates badminton smash speed at impact, reporting much higher values than a radar gun, but the validation and released artifacts are insufficient.
Limitations of doppler radar for small, low-velocity projectiles,
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A Real-Time, Vision-Based System for Badminton Smash Speed Estimation on Mobile Devices
A phone-based YOLOv5+Kalman pipeline estimates badminton smash speed at impact, reporting much higher values than a radar gun, but the validation and released artifacts are insufficient.